summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/bpf/progs/test_attach_probe.c
blob: a1e45fec8938edafdace88b9c271a8611099f6e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017 Facebook

#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include "bpf_misc.h"

int kprobe_res = 0;
int kprobe2_res = 0;
int kretprobe_res = 0;
int kretprobe2_res = 0;
int uprobe_res = 0;
int uretprobe_res = 0;
int uprobe_byname_res = 0;
int uretprobe_byname_res = 0;
int uprobe_byname2_res = 0;
int uretprobe_byname2_res = 0;
int uprobe_byname3_sleepable_res = 0;
int uprobe_byname3_res = 0;
int uretprobe_byname3_sleepable_res = 0;
int uretprobe_byname3_res = 0;
void *user_ptr = 0;

SEC("kprobe")
int handle_kprobe(struct pt_regs *ctx)
{
	kprobe_res = 1;
	return 0;
}

SEC("ksyscall/nanosleep")
int BPF_KSYSCALL(handle_kprobe_auto, struct __kernel_timespec *req, struct __kernel_timespec *rem)
{
	kprobe2_res = 11;
	return 0;
}

/**
 * This program will be manually made sleepable on the userspace side
 * and should thus be unattachable.
 */
SEC("kprobe/" SYS_PREFIX "sys_nanosleep")
int handle_kprobe_sleepable(struct pt_regs *ctx)
{
	kprobe_res = 2;
	return 0;
}

SEC("kretprobe")
int handle_kretprobe(struct pt_regs *ctx)
{
	kretprobe_res = 2;
	return 0;
}

SEC("kretsyscall/nanosleep")
int BPF_KRETPROBE(handle_kretprobe_auto, int ret)
{
	kretprobe2_res = 22;
	return ret;
}

SEC("uprobe")
int handle_uprobe(struct pt_regs *ctx)
{
	uprobe_res = 3;
	return 0;
}

SEC("uretprobe")
int handle_uretprobe(struct pt_regs *ctx)
{
	uretprobe_res = 4;
	return 0;
}

SEC("uprobe")
int handle_uprobe_byname(struct pt_regs *ctx)
{
	uprobe_byname_res = 5;
	return 0;
}

/* use auto-attach format for section definition. */
SEC("uretprobe//proc/self/exe:trigger_func2")
int handle_uretprobe_byname(struct pt_regs *ctx)
{
	uretprobe_byname_res = 6;
	return 0;
}

SEC("uprobe")
int handle_uprobe_byname2(struct pt_regs *ctx)
{
	unsigned int size = PT_REGS_PARM1(ctx);

	/* verify malloc size */
	if (size == 1)
		uprobe_byname2_res = 7;
	return 0;
}

SEC("uretprobe")
int handle_uretprobe_byname2(struct pt_regs *ctx)
{
	uretprobe_byname2_res = 8;
	return 0;
}

static __always_inline bool verify_sleepable_user_copy(void)
{
	char data[9];

	bpf_copy_from_user(data, sizeof(data), user_ptr);
	return bpf_strncmp(data, sizeof(data), "test_data") == 0;
}

SEC("uprobe.s//proc/self/exe:trigger_func3")
int handle_uprobe_byname3_sleepable(struct pt_regs *ctx)
{
	if (verify_sleepable_user_copy())
		uprobe_byname3_sleepable_res = 9;
	return 0;
}

/**
 * same target as the uprobe.s above to force sleepable and non-sleepable
 * programs in the same bpf_prog_array
 */
SEC("uprobe//proc/self/exe:trigger_func3")
int handle_uprobe_byname3(struct pt_regs *ctx)
{
	uprobe_byname3_res = 10;
	return 0;
}

SEC("uretprobe.s//proc/self/exe:trigger_func3")
int handle_uretprobe_byname3_sleepable(struct pt_regs *ctx)
{
	if (verify_sleepable_user_copy())
		uretprobe_byname3_sleepable_res = 11;
	return 0;
}

SEC("uretprobe//proc/self/exe:trigger_func3")
int handle_uretprobe_byname3(struct pt_regs *ctx)
{
	uretprobe_byname3_res = 12;
	return 0;
}


char _license[] SEC("license") = "GPL";